Rockies' Arenado exits with chest contusion
Arenado was injured while diving into the stands attempting to catch a pop fly in the sixth inning.
The 24-year-old has 36 home runs, tied for the National League lead with teammate Carlos Gonzalez. The two-time Gold Glove winner is hitting .287 with 106 RBIs this season.
Arenado was 1 for 3 with a double and an RBI in the Rockies' 6-4 win over the Padres.